Stuffing-box



(No Model.)

L. O. S. FRIOK.

STUFFING BOX.

No. 404,529. Patented June 4, 1889.

UNITED STATES PATENT @FFICE.

LOUIS O. S. FRIOK, OF BUFFALO, NElV YORK.

STU FFING-BOX.

SPECIFICATION forming part of Letters Patent No. 404,529, dated June 4,1889.

Application filed March 3, 1888. Serial No. 266,057. (No model.)

To all whom it may concern:

Be it known that I, LOUIS O. S. FRIOK, of the city of Buffalo in thecounty of Erie and State of New York, have invented new and usefulImprovements in Stuffing-Boxes, of

which the following is a specification.

This invention relates to a stufiing-box for locomotive and otherhorizontal engines, and more particularly to that class of stuffingboxesin which a metallic packing is employed.

My invention has forits object to provide a reliable and simple packingof this character which is comparatively inexpensive and which can bereadily renewed when required.

The invention consists to that vend of the improvements which will behereinafter fully described, and pointed out in the claim.

In the accompanying drawings, Figure 1 is a longitudinal sectionalelevation of my improved stuffing-box applied to the piston-rod of asteam-cylinder. Fig. 2 is across-section in line x 00, Fig. 1. Fig. 3 isa side elevation of the metallic packing, showing the two halves thereofseparated. Fig. 4 is an end elevation of the halves of said packingseparated. Fig. 5 is a cross-section of the follower and the springbearing against the same.

Like letters of reference refer to like parts in the several figures.

A represents the head of the cylinder, which is provided on its outerside with a cylindrical stufiing-box A, and B is the piston-rod passingthrough the head A and the stuffingbox.

5 0 represents a gland fitting into the outer end of the stuiiing-box Aand adjustab'ly secured to the latter by bolts a, passing through thegland. A tight joint is formed between the gland O and the outer endofthe stuffingbox A by means of a packing-ring c, of copper or othersuitable material, arranged between these parts or in any other suitablemanner.

D is a bushing, preferably provided with an outwardly-tapering exteriorsurface seated in 5 a tapering cavity formed in the gland C. The

bushing D is provided with an outwardly-tapering cavity (1. The innerend of the bushin g is provided with an annular flange or collar d,which fits into an annular depression formed in the inner end of thegland O and prevents the steam or other fluid from escaping through thebore of the gland.

E represent-s the packing of soft getal surforwardly-taperin g portionin the concave cavity cl of the bushing D. The metallic packing E isdivided longitudinally into two halves or sections e e, which embraceopposite sides of the piston-rod. The sections 6 e are provided at theircontiguous longitudinal faces with interlocking projections and recessesf f f 2 f as shown in Figs. 1, 3, and 4, whereby tight joints are formedbetween the sections.

g represents a ring or follower arranged within the stuffing-box A,behind the packingsections e e, and provided with a concave seat ordepression g, which bears against the rearwardly-taperin g ends of saidsections.

H is a volute spring surrounding the pistonrod, and bearing with itsfront end against the rear side of the follow-er g and with its rear endagainst a recessed ring 1T, arranged in the rear end of the stuffing-boxA. The spring H presses the follower 9 against the rear ends of thepacking-sections e e, thereby forcing the latter into the taperingcavity d and compressing the sections tightly around the piston-rod. Therear portions of the packingsections are compressed directly by the ringg, embracing the same, and the front portions of the packing'sectionsare compressed by being driven into the tapering cavity of the bushing.

The external diameter of the bushing D is somewhat smaller than that ofthe bore of the gland O, as shown, to give the bushing a slight verticalplay in the gland, so that as the piston-rod and cross-head of theengine descend slightly by wear the bushing will take part in thissinking of the piston-rod and thereby prevent binding of the same.

j is a ring of felt or other suitable material surrounding thepiston-rod in front of the packing-sections e c, and whereby the rod iskept clean. The ring j bears against the outer end of the bushing D andagainst an annular shoulder 70, formed in the bore of the gland 0 nearthe outer end thereof, and is held in its seat by a ringZ, secured in adepression in the outer end of the gland.

The opening in the ring Zis somewhat larger than the piston-rod B, asshown, to allow the rod to descend slightly as the cross-head of theengine becomes worn.

Upon removing the nuts of the bolt 0 the gland C and bushing D can bemoved on the piston-rod away from the end of the stuffing box A, and thepacking-sections e 6 can be removed when worn and be replaced by newsections, if required. The followerg retains the packing-sections c e intheir seat (Z at all times and automatically takes up the wear of thesame,while the parts are properly adjusted by means of the bolts 0 ofthe gland C.

It will be observed that the bushing is seated so as to be steam-tightat two points, the collar (1' fitting into an annular depression in thegland at one end and the bushing bearing against the annular shoulder kof the gland near the other end. At the same time provision is made thatthe bushing D, piston-rod, and packing E may all descend together,preserving their proper relations to each other in case of wear of thepiston-rod and cross-head, because a space is left between the pistonrodand ringl and between all parts of the bushing and the gland.

It will also be observed that the bushing has a tapering concavity (Z,which is not concentric with the oval or curved surface of the packingE. By this construction any settlement due to wear is accommodatedwithout interfering with the proper fit between the packing and thebushing, and at the same time space is left in the bushing for thepacking to be pressed into its seat farther. Where the cavity and thepacking are made tapering and in parallel lines, the settlement due towear of the piston or cross-head destroys the accurate fit or seating ofthe packing within the tapering cavity of the bushing. The form I haveadopted does away with this difficulty and preserves the seating of thepacking within the cavity of the bushing perfect, notwithstanding anysettlement of the piston-rod due to wear.

I claim as my invention- The combination, with the stufling-box A, ofthe gland C, provided with a tapering cavity, the tapering bushingloosely fitting all around its sides in said cavity so as to leave anannular space, the flange (1, the shoulder 70, the oval-shaped packingE, fitting in an oval cavity in the bushing so as to leave a space dbetween the two, an d the ring Z, loosely fitting around the piston,whereby provision is made for the settlement of the piston by wear, soas to preserve the fit of all the parts, substantially as set forth.

\Vitnessiuy hand this 16th day of February, 1888. I

LOUIS C. S. FRIUK. \Vitnesses:

CHESTER D. Ilown FRED O. Gnvnn.

